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Прочитайте текст и выполните задания. Rarefaction 1. Rarefaction is the reduction of an item’s densi...: ответ на тест 1120715 - Английский язык

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Rarefaction
1. Rarefaction is the reduction of an item’s density, the opposite of compression. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature. A common rarefaction wave is the area of low relative pressure following a shock wave.
2. Rarefaction waves expand with time (much like sea waves spread out as they reach a beach); in most gases rarefaction waves keep the same «shape» at all times throughout the wave’s movement: it is a «self-similar expansion». Each part of the wave travels at the local speed of sound, in the local medium. This expansion behaviour is in contrast to the behaviour of pressure increases, which get narrower with time, until they steepen into shock waves.
3. A natural example of rarefaction occurs in the layers of Earth’s atmosphere. Because the atmosphere has mass, most atmospheric matter is nearer to the Earth due to the Earth’s gravitation. Therefore, air at higher layers of the atmosphere is less dense, or rarefied, relative to air at lower layers. Thus rarefaction can refer either to a reduction in density over space at a single point of time, or a reduction of density over time for one particular area.
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Rarefaction waves movement …
Варианты ответов
  • in gases is characterized by keeping the same «shape»
  • is more intensive at lower layers of Earth’s atmosphere
  • characteristics are similar to compression wave’s one
  • is characterized by expansion with time
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Вопрос задал(а): Анонимный пользователь, 13 Ноябрь 2020 в 20:43
На вопрос ответил(а): Анастасия Степанова, 13 Ноябрь 2020 в 20:43

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Прочитайте текст и выполните задания.
Rarefaction
1. Rarefaction is the reduction of an item’s density, the opposite of compression. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature. A common rarefaction wave is the area of low relative pressure following a shock wave.
2. Rarefaction waves expand with time (much like sea waves spread out as they reach a beach); in most gases rarefaction waves keep the same «shape» at all times throughout the wave’s movement: it is a «self-similar expansion». Each part of the wave travels at the local speed of sound, in the local medium. This expansion behaviour is in contrast to the behaviour of pressure increases, which get narrower with time, until they steepen into shock waves.
3. A natural example of rarefaction occurs in the layers of Earth’s atmosphere. Because the atmosphere has mass, most atmospheric matter is nearer to the Earth due to the Earth’s gravitation. Therefore, air at higher layers of the atmosphere is less dense, or rarefied, relative to air at lower layers. Thus rarefaction can refer either to a reduction in density over space at a single point of time, or a reduction of density over time for one particular area.
Завершите утверждение согласно содержанию текста.
Rarefaction waves movement …
characteristics are similar to compression wave’s one
is more intensive at lower layers of Earth’s atmosphere
is characterized by expansion with time
in gases is characterized by keeping the same «shape»

Вопрос № 1120720

Прочитайте текст и выполните задания.
Rarefaction
1. Rarefaction is the reduction of an item’s density, the opposite of compression. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature. A common rarefaction wave is the area of low relative pressure following a shock wave.
2. Rarefaction waves expand with time (much like sea waves spread out as they reach a beach); in most gases rarefaction waves keep the same «shape» at all times throughout the wave’s movement: it is a «self-similar expansion». Each part of the wave travels at the local speed of sound, in the local medium. This expansion behaviour is in contrast to the behaviour of pressure increases, which get narrower with time, until they steepen into shock waves.
3. A natural example of rarefaction occurs in the layers of Earth’s atmosphere. Because the atmosphere has mass, most atmospheric matter is nearer to the Earth due to the Earth’s gravitation. Therefore, air at higher layers of the atmosphere is less dense, or rarefied, relative to air at lower layers. Thus rarefaction can refer either to a reduction in density over space at a single point of time, or a reduction of density over time for one particular area.
Ответьте на вопрос:
What layer of Earth’s atmosphere do rarefaction waves exist in?
They occur at all layers of Earth’s atmosphere.
They occur at both higher and lower layers of Earth’s atmosphere.
They occur at lower layers of Earth’s atmosphere.
They occur at higher layers of Earth’s atmosphere.

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Twilight
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Вопрос № 1120719

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Ответьте на вопрос:
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